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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4865) Off-heap bloom filters
Date Tue, 30 Oct 2012 16:14:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486977#comment-13486977
] 

Jonathan Ellis commented on CASSANDRA-4865:
-------------------------------------------

Would prefer to not need to rewrite existing sstables to get off-heap BF -- seems to me we
can make the off heap de/serialize code compatible with the original OpenBitSet code.  Slightly
ugly to have the unnecessary pageCount/Size business but worth it to get instant off-heap
BF on upgrade.
                
> Off-heap bloom filters
> ----------------------
>
>                 Key: CASSANDRA-4865
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4865
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Vijay
>             Fix For: 1.2.1
>
>         Attachments: 0001-CASSANDRA-4865.patch, 0001-CASSANDRA-4865-v2.patch
>
>
> Bloom filters are the major user of heap as dataset grows.  It's probably worth it to
move these off heap.  No extra refcounting needs to be done since we already refcount SSTableReader.

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